/* ============================================================
   AUTH.CSS — Modern SaaS Authentication Page
   Smart Building IoT Management App
   ============================================================ */

/* --- CSS Variables --- */
:root {
    --auth-primary: #662179;
    --auth-primary-dark: #4b0c68;
    --auth-primary-light: #8b2fa3;
    --auth-accent: #9b59b6;
    --auth-blue: #3a7bd5;
    --auth-text: #2d3436;
    --auth-text-secondary: #636e72;
    --auth-text-muted: #b2bec3;
    --auth-white: #ffffff;
    --auth-bg: #f8f9fd;
    --auth-border: #e1e5ee;
    --auth-error: #e74c3c;
    --auth-success: #27ae60;
    --auth-radius: 24px;
    --auth-radius-sm: 12px;
    --auth-radius-xs: 8px;
    --auth-shadow: 0 25px 80px rgba(102, 33, 121, 0.25);
    --auth-transition: 0.6s ease-in-out;
    --auth-font: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
}

/* --- Reset --- */
.auth-page,
.auth-page * ,
.auth-page *::before,
.auth-page *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* --- Page Background --- */
.auth-page {
    font-family: var(--auth-font);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background:
        linear-gradient(135deg, rgba(15, 5, 33, 0.82) 0%, rgba(26, 10, 46, 0.78) 25%, rgba(45, 18, 69, 0.75) 50%, rgba(26, 16, 64, 0.80) 75%, rgba(15, 5, 33, 0.85) 100%),
        url('/image/mantu-background.jpg') center / cover no-repeat fixed;
    background-size: 400% 400%, cover;
    animation: authGradientShift 20s ease infinite;
    overflow: hidden;
    position: relative;
}

@keyframes authGradientShift {
    0%   { background-position: 0% 50%; }
    50%  { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* --- Ambient Background Particles --- */
.auth-page::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        radial-gradient(2px 2px at 20% 30%, rgba(155, 89, 182, 0.3), transparent),
        radial-gradient(2px 2px at 80% 20%, rgba(58, 123, 213, 0.25), transparent),
        radial-gradient(2px 2px at 40% 70%, rgba(155, 89, 182, 0.2), transparent),
        radial-gradient(2px 2px at 70% 80%, rgba(58, 123, 213, 0.3), transparent),
        radial-gradient(1px 1px at 10% 90%, rgba(255, 255, 255, 0.15), transparent),
        radial-gradient(1px 1px at 90% 50%, rgba(255, 255, 255, 0.1), transparent),
        radial-gradient(1px 1px at 50% 10%, rgba(155, 89, 182, 0.2), transparent),
        radial-gradient(1px 1px at 30% 50%, rgba(255, 255, 255, 0.08), transparent),
        radial-gradient(1px 1px at 60% 40%, rgba(58, 123, 213, 0.15), transparent);
    animation: authParticlesDrift 30s linear infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes authParticlesDrift {
    0%   { transform: translateY(0) translateX(0); }
    50%  { transform: translateY(-20px) translateX(10px); }
    100% { transform: translateY(0) translateX(0); }
}

/* ============================================================
   MAIN CONTAINER
   ============================================================ */
.auth-container {
    position: relative;
    width: 960px;
    max-width: 95vw;
    min-height: 600px;
    border-radius: var(--auth-radius);
    overflow: hidden;
    box-shadow: var(--auth-shadow);
    background: var(--auth-white);
    z-index: 1;
    animation: authContainerEntrance 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes authContainerEntrance {
    0%   { opacity: 0; transform: scale(0.92) translateY(30px); }
    100% { opacity: 1; transform: scale(1) translateY(0); }
}

/* ============================================================
   FORM CONTAINERS
   ============================================================ */
.form-container {
    position: absolute;
    top: 0;
    height: 100%;
    width: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--auth-transition);
    background: var(--auth-white);
}

.form-container .form-wrapper {
    width: 100%;
    max-width: 360px;
    padding: 40px 32px;
}

/* --- Sign In Container --- */
.sign-in-container {
    left: 0;
    z-index: 2;
}

/* --- Sign Up Container --- */
.sign-up-container {
    left: 0;
    opacity: 0;
    z-index: 1;
}

/* --- Active State: slide forms --- */
.auth-container.right-panel-active .sign-in-container {
    transform: translateX(100%);
}

.auth-container.right-panel-active .sign-up-container {
    transform: translateX(100%);
    opacity: 1;
    z-index: 5;
    animation: authFormShow 0.6s;
}

@keyframes authFormShow {
    0%, 49.99%  { opacity: 0; z-index: 1; }
    50%, 100%   { opacity: 1; z-index: 5; }
}

/* ============================================================
   FORM STYLES
   ============================================================ */

/* --- Logo --- */
.auth-logo {
    width: 140px;
    height: auto;
    margin-bottom: 8px;
    display: block;
    animation: authFadeSlideDown 0.6s 0.3s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes authFadeSlideDown {
    0%   { opacity: 0; transform: translateY(-15px); }
    100% { opacity: 1; transform: translateY(0); }
}

@keyframes authFadeSlideUp {
    0%   { opacity: 0; transform: translateY(20px); }
    100% { opacity: 1; transform: translateY(0); }
}

@keyframes authFadeIn {
    0%   { opacity: 0; }
    100% { opacity: 1; }
}

@keyframes authSlideInLeft {
    0%   { opacity: 0; transform: translateX(-30px); }
    100% { opacity: 1; transform: translateX(0); }
}

@keyframes authSlideInRight {
    0%   { opacity: 0; transform: translateX(30px); }
    100% { opacity: 1; transform: translateX(0); }
}

@keyframes authBounceIn {
    0%   { opacity: 0; transform: scale(0.3); }
    50%  { transform: scale(1.05); }
    70%  { transform: scale(0.95); }
    100% { opacity: 1; transform: scale(1); }
}

/* --- Headings --- */
.auth-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--auth-text);
    margin-bottom: 6px;
    letter-spacing: -0.5px;
    animation: authFadeSlideUp 0.5s 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.auth-subtitle {
    font-size: 14px;
    color: var(--auth-text-secondary);
    margin-bottom: 28px;
    font-weight: 400;
    animation: authFadeSlideUp 0.5s 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
}

/* --- Input Groups --- */
.auth-input-group {
    position: relative;
    margin-bottom: 18px;
    animation: authFadeSlideUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.sign-in-container .auth-input-group:nth-child(1) { animation-delay: 0.55s; }
.sign-in-container .auth-input-group:nth-child(2) { animation-delay: 0.65s; }
.sign-up-container .auth-input-group:nth-child(1) { animation-delay: 0.3s; }
.sign-up-container .auth-input-group:nth-child(2) { animation-delay: 0.4s; }
.sign-up-container .auth-input-group:nth-child(3) { animation-delay: 0.5s; }
.sign-up-container .auth-input-group:nth-child(4) { animation-delay: 0.6s; }
.sign-up-container .auth-input-group:nth-child(5) { animation-delay: 0.7s; }
.auth-input-row { animation: authFadeSlideUp 0.5s 0.55s cubic-bezier(0.16, 1, 0.3, 1) both; }

.auth-input-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--auth-text);
    margin-bottom: 6px;
    letter-spacing: 0.2px;
}

.auth-input-group .input-wrapper {
    position: relative;
}

.auth-input-group .input-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--auth-text-muted);
    pointer-events: none;
    transition: color 0.3s ease;
}

.auth-input-group .input-icon svg {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.auth-input {
    width: 100%;
    padding: 12px 14px 12px 44px;
    border: 1.5px solid var(--auth-border);
    border-radius: var(--auth-radius-xs);
    font-family: var(--auth-font);
    font-size: 14px;
    color: var(--auth-text);
    background: var(--auth-bg);
    transition: all 0.3s ease;
    outline: none;
}

.auth-input::placeholder {
    color: var(--auth-text-muted);
    font-weight: 400;
}

.auth-input:hover {
    border-color: var(--auth-primary-light);
}

.auth-input:focus {
    border-color: var(--auth-primary);
    background: var(--auth-white);
    box-shadow: 0 0 0 3px rgba(102, 33, 121, 0.1);
}

.auth-input:focus + .input-icon,
.auth-input:focus ~ .input-icon {
    color: var(--auth-primary);
}

/* --- Password Toggle --- */
.auth-password-toggle {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: var(--auth-text-muted);
    background: none;
    border: none;
    padding: 2px;
    display: flex;
    align-items: center;
    transition: color 0.3s ease;
}

.auth-password-toggle:hover {
    color: var(--auth-primary);
}

.auth-password-toggle svg {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* --- Submit Button --- */
.auth-btn {
    width: 100%;
    padding: 13px 24px;
    border: none;
    border-radius: var(--auth-radius-xs);
    font-family: var(--auth-font);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    letter-spacing: 0.3px;
    margin-top: 6px;
    animation: authFadeSlideUp 0.5s 0.75s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.auth-btn-primary {
    background: linear-gradient(135deg, var(--auth-primary), var(--auth-primary-light));
    color: var(--auth-white);
    box-shadow: 0 4px 15px rgba(102, 33, 121, 0.3);
}

.auth-btn-primary:hover {
    background: linear-gradient(135deg, var(--auth-primary-dark), var(--auth-primary));
    box-shadow: 0 6px 25px rgba(102, 33, 121, 0.4);
    transform: translateY(-1px);
}

.auth-btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(102, 33, 121, 0.3);
}

/* --- Links --- */
.auth-switch {
    text-align: center;
    margin-top: 24px;
    font-size: 13.5px;
    color: var(--auth-text-secondary);
    animation: authFadeIn 0.6s 0.9s both;
}

.auth-switch a {
    color: var(--auth-primary);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: color 0.3s ease;
}

.auth-switch a:hover {
    color: var(--auth-primary-dark);
    text-decoration: underline;
}

/* --- Messages --- */
.auth-message {
    padding: 10px 14px;
    border-radius: var(--auth-radius-xs);
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.auth-message-error {
    background: rgba(231, 76, 60, 0.08);
    color: var(--auth-error);
    border: 1px solid rgba(231, 76, 60, 0.15);
}

.auth-message-success {
    background: rgba(39, 174, 96, 0.08);
    color: var(--auth-success);
    border: 1px solid rgba(39, 174, 96, 0.15);
}

.auth-message-info {
    background: rgba(102, 33, 121, 0.06);
    color: var(--auth-primary);
    border: 1px solid rgba(102, 33, 121, 0.12);
}

.auth-message svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* --- Inline Row (firstname + lastname) --- */
.auth-input-row {
    display: flex;
    gap: 12px;
}

.auth-input-row .auth-input-group {
    flex: 1;
    min-width: 0;
}

/* --- Confirm Password Error --- */
.auth-field-error {
    font-size: 12px;
    color: var(--auth-error);
    margin-top: 4px;
    display: none;
}

.auth-field-error.visible {
    display: block;
}

/* ============================================================
   OVERLAY CONTAINER (Sliding Visual Panel)
   ============================================================ */
.overlay-container {
    position: absolute;
    top: 0;
    left: 50%;
    width: 50%;
    height: 100%;
    overflow: hidden;
    transition: transform var(--auth-transition);
    z-index: 100;
}

.auth-container.right-panel-active .overlay-container {
    transform: translateX(-100%);
}

/* --- Overlay Inner (double-width for sliding) --- */
.overlay {
    position: relative;
    left: -100%;
    height: 100%;
    width: 200%;
    background: linear-gradient(135deg, #1a0a2e 0%, var(--auth-primary-dark) 30%, var(--auth-primary) 60%, var(--auth-primary-light) 100%);
    transition: transform var(--auth-transition);
}

.auth-container.right-panel-active .overlay {
    transform: translateX(50%);
}

/* --- Overlay Panels --- */
.overlay-panel {
    position: absolute;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    text-align: center;
    height: 100%;
    width: 50%;
    padding: 40px;
    transition: transform var(--auth-transition);
}

.overlay-left {
    transform: translateX(-20%);
}

.auth-container.right-panel-active .overlay-left {
    transform: translateX(0);
}

.overlay-right {
    right: 0;
    transform: translateX(0);
}

.auth-container.right-panel-active .overlay-right {
    transform: translateX(20%);
}

/* --- Overlay Content --- */
.overlay-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--auth-white);
    margin-bottom: 12px;
    letter-spacing: -0.5px;
    animation: authFadeSlideUp 0.6s 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.overlay-text {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 32px;
    line-height: 1.6;
    max-width: 280px;
    animation: authFadeSlideUp 0.6s 0.65s cubic-bezier(0.16, 1, 0.3, 1) both;
}

/* --- Ghost Button on Overlay --- */
.auth-btn-ghost {
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.6);
    color: var(--auth-white);
    padding: 11px 40px;
    border-radius: var(--auth-radius-xs);
    font-family: var(--auth-font);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 0.3px;
    animation: authFadeSlideUp 0.6s 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.auth-btn-ghost:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.9);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

/* ============================================================
   OVERLAY ILLUSTRATION (SVG Smart Building)
   ============================================================ */
.overlay-illustration {
    width: 200px;
    height: 200px;
    margin-bottom: 24px;
    position: relative;
    animation: authBounceIn 0.8s 0.2s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.overlay-illustration svg {
    width: 100%;
    height: 100%;
}

/* --- Animated Glow on Building --- */
.building-glow {
    animation: authBuildingGlow 3s ease-in-out infinite;
}

@keyframes authBuildingGlow {
    0%, 100% { opacity: 0.4; }
    50%      { opacity: 0.9; }
}

/* --- Sensor Pulse --- */
.sensor-dot {
    animation: authSensorPulse 2s ease-in-out infinite;
}

.sensor-dot:nth-child(2) { animation-delay: 0.5s; }
.sensor-dot:nth-child(3) { animation-delay: 1.0s; }
.sensor-dot:nth-child(4) { animation-delay: 1.5s; }

@keyframes authSensorPulse {
    0%, 100% { opacity: 0.4; r: 3; }
    50%      { opacity: 1;   r: 5; }
}

/* --- Signal Waves --- */
.signal-wave {
    animation: authSignalWave 2.5s ease-out infinite;
    transform-origin: center;
}

.signal-wave:nth-child(2) { animation-delay: 0.8s; }
.signal-wave:nth-child(3) { animation-delay: 1.6s; }

@keyframes authSignalWave {
    0%   { opacity: 0.8; transform: scale(1); }
    100% { opacity: 0;   transform: scale(2.5); }
}

/* --- Floating Particles on Overlay --- */
.overlay-particles {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    overflow: hidden;
    pointer-events: none;
}

.overlay-particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    animation: authFloat linear infinite;
}

.overlay-particle:nth-child(1) { left: 10%; animation-duration: 12s; animation-delay: 0s;   width: 3px; height: 3px; }
.overlay-particle:nth-child(2) { left: 25%; animation-duration: 15s; animation-delay: 2s;   width: 5px; height: 5px; }
.overlay-particle:nth-child(3) { left: 45%; animation-duration: 10s; animation-delay: 4s; }
.overlay-particle:nth-child(4) { left: 65%; animation-duration: 14s; animation-delay: 1s;   width: 3px; height: 3px; }
.overlay-particle:nth-child(5) { left: 80%; animation-duration: 11s; animation-delay: 3s;   width: 6px; height: 6px; }
.overlay-particle:nth-child(6) { left: 35%; animation-duration: 16s; animation-delay: 5s;   width: 2px; height: 2px; }
.overlay-particle:nth-child(7) { left: 55%; animation-duration: 13s; animation-delay: 6s; }
.overlay-particle:nth-child(8) { left: 90%; animation-duration: 9s;  animation-delay: 1.5s; width: 3px; height: 3px; }

@keyframes authFloat {
    0%   { transform: translateY(100vh) rotate(0deg);   opacity: 0; }
    10%  { opacity: 0.6; }
    90%  { opacity: 0.6; }
    100% { transform: translateY(-100px) rotate(360deg); opacity: 0; }
}

/* ============================================================
   RESPONSIVE DESIGN
   ============================================================ */

/* --- Tablet --- */
@media (max-width: 900px) {
    .auth-container {
        width: 90vw;
        min-height: 580px;
    }

    .overlay-illustration {
        width: 150px;
        height: 150px;
    }

    .overlay-title {
        font-size: 24px;
    }

    .overlay-text {
        font-size: 13px;
    }

    .form-container .form-wrapper {
        padding: 30px 24px;
        max-width: 320px;
    }

    .auth-title {
        font-size: 23px;
    }
}

/* --- Mobile --- */
@media (max-width: 680px) {
    .auth-page {
        align-items: flex-start;
        padding: 20px 0;
    }

    .auth-container {
        width: 94vw;
        min-height: auto;
        border-radius: 18px;
        display: flex;
        flex-direction: column;
    }

    /* Hide the sliding overlay on mobile */
    .overlay-container {
        position: relative;
        left: 0;
        width: 100%;
        height: 180px;
        order: -1;
        z-index: 1;
    }

    .auth-container.right-panel-active .overlay-container {
        transform: none;
    }

    .overlay {
        left: 0;
        width: 100%;
        background: linear-gradient(135deg, var(--auth-primary-dark), var(--auth-primary), var(--auth-primary-light));
    }

    .auth-container.right-panel-active .overlay {
        transform: none;
    }

    .overlay-panel {
        width: 100%;
        padding: 24px;
    }

    .overlay-left {
        display: none;
    }

    .overlay-right {
        position: relative;
    }

    .auth-container.right-panel-active .overlay-right {
        display: none;
    }

    .auth-container.right-panel-active .overlay-left {
        display: flex;
        transform: none;
        position: relative;
    }

    .overlay-illustration {
        width: 60px;
        height: 60px;
        margin-bottom: 8px;
    }

    .overlay-title {
        font-size: 18px;
        margin-bottom: 4px;
    }

    .overlay-text {
        display: none;
    }

    .auth-btn-ghost {
        padding: 8px 28px;
        font-size: 13px;
    }

    .overlay-particles {
        display: none;
    }

    /* Stack form containers */
    .form-container {
        position: relative;
        width: 100%;
        height: auto;
        min-height: 0;
    }

    .sign-in-container {
        z-index: 2;
        display: flex;
    }

    .sign-up-container {
        z-index: 1;
        opacity: 0;
        display: none;
        position: absolute;
        top: 0;
        left: 0;
    }

    .auth-container.right-panel-active .sign-in-container {
        transform: none;
        display: none;
    }

    .auth-container.right-panel-active .sign-up-container {
        transform: none;
        opacity: 1;
        z-index: 5;
        display: flex;
        position: relative;
        animation: none;
    }

    .form-container .form-wrapper {
        padding: 28px 24px;
        max-width: 100%;
    }

    .auth-title {
        font-size: 22px;
    }

    .auth-input-row {
        flex-direction: column;
        gap: 0;
    }
}

/* --- Small Mobile --- */
@media (max-width: 400px) {
    .auth-container {
        width: 100vw;
        border-radius: 0;
    }

    .form-container .form-wrapper {
        padding: 24px 20px;
    }

    .auth-input {
        padding: 11px 12px 11px 40px;
        font-size: 13.5px;
    }

    .auth-btn {
        padding: 12px 20px;
        font-size: 14px;
    }
}

/* ============================================================
   UTILITIES & EXTRAS
   ============================================================ */

/* --- Divider --- */
.auth-divider {
    display: flex;
    align-items: center;
    margin: 18px 0;
    gap: 12px;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--auth-border);
}

.auth-divider span {
    font-size: 12px;
    color: var(--auth-text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* --- Scroll for register form on short screens --- */
.sign-up-container .form-wrapper {
    max-height: 100%;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: rgba(102, 33, 121, 0.2) transparent;
}

.sign-up-container .form-wrapper::-webkit-scrollbar {
    width: 4px;
}

.sign-up-container .form-wrapper::-webkit-scrollbar-thumb {
    background: rgba(102, 33, 121, 0.2);
    border-radius: 4px;
}

/* ============================================================
   ENHANCED SLIDE & TRANSITION ANIMATIONS
   ============================================================ */

/* --- Smoother panel slide with slight bounce --- */
.auth-container.right-panel-active .sign-in-container {
    transform: translateX(100%);
    transition: all 0.65s cubic-bezier(0.68, -0.15, 0.27, 1.15);
}

.auth-container.right-panel-active .sign-up-container {
    transition: all 0.65s cubic-bezier(0.68, -0.15, 0.27, 1.15);
}

.overlay-container {
    transition: transform 0.65s cubic-bezier(0.68, -0.15, 0.27, 1.15);
}

.overlay {
    transition: transform 0.65s cubic-bezier(0.68, -0.15, 0.27, 1.15);
}

.overlay-panel {
    transition: transform 0.65s cubic-bezier(0.68, -0.15, 0.27, 1.15);
}

/* --- Input focus ripple effect --- */
.auth-input:focus {
    animation: authInputFocusRipple 0.4s ease;
}

@keyframes authInputFocusRipple {
    0%   { box-shadow: 0 0 0 0 rgba(102, 33, 121, 0.3); }
    70%  { box-shadow: 0 0 0 6px rgba(102, 33, 121, 0.08); }
    100% { box-shadow: 0 0 0 3px rgba(102, 33, 121, 0.1); }
}

/* --- Button press pulse --- */
.auth-btn-primary:active {
    animation: authBtnPulse 0.3s ease;
}

@keyframes authBtnPulse {
    0%   { box-shadow: 0 0 0 0 rgba(102, 33, 121, 0.5); }
    100% { box-shadow: 0 0 0 12px rgba(102, 33, 121, 0); }
}

/* --- Message entrance --- */
.auth-message {
    animation: authSlideInLeft 0.5s 0.3s cubic-bezier(0.16, 1, 0.3, 1) both;
}

/* --- Overlay illustration continuous float --- */
.overlay-illustration {
    animation: authBounceIn 0.8s 0.2s cubic-bezier(0.16, 1, 0.3, 1) both,
               authIllustrationFloat 4s 1s ease-in-out infinite;
}

@keyframes authIllustrationFloat {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-10px); }
}

/* --- Logo subtle shimmer --- */
.auth-logo {
    transition: transform 0.3s ease, filter 0.3s ease;
}

.auth-logo:hover {
    transform: scale(1.05);
    filter: brightness(1.1);
}

/* --- Link underline slide-in effect --- */
.auth-switch a {
    position: relative;
}

.auth-switch a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--auth-primary);
    border-radius: 2px;
    transition: width 0.3s ease;
}

.auth-switch a:hover::after {
    width: 100%;
}

.auth-switch a:hover {
    text-decoration: none;
}

/* --- Ghost button border glow on hover --- */
.auth-btn-ghost::before {
    content: '';
    position: absolute;
    top: -2px; left: -2px; right: -2px; bottom: -2px;
    border-radius: calc(var(--auth-radius-xs) + 2px);
    background: linear-gradient(135deg, rgba(255,255,255,0.4), rgba(155,89,182,0.3), rgba(58,123,213,0.3));
    opacity: 0;
    z-index: -1;
    transition: opacity 0.4s ease;
}

.auth-btn-ghost {
    position: relative;
    overflow: visible;
}

.auth-btn-ghost:hover::before {
    opacity: 1;
}